The main drift chamber of the Beijing Spectrometer (BES) has been described briefly, including its physical design, mechanical design and construction, choice of the working gas as well as prototyping.是什么意思_The main drift chamber of the Beijing Spectrometer (BES) has been described briefly, including its physical design, mechanical design and construction, choice of the working gas as well as prototyping.在线翻译_英语_读音_用法_例句